C->Haskell is an interface generator that simplifies the development of Haskell bindings to C libraries. The tool processes existing C header files that determine data layout and function signatures on the C side in conjunction with Haskell modules that specify Haskell-side type signatures and marshaling details. Hooks embedded in the Haskell code signal access to C structures and functions; they are expanded by the interfacing tool in dependence on information from the corresponding C header file.

The Glasgow Haskell Compiler is a robust, fully-featured, optimising compiler for the functional programming language Haskell. GHC compiles Haskell to either native code or C. It implements numerous experimental language extensions to Haskell for example concurrency, a foreign language interface, several type-system extensions, exceptions, and so on. GHC comes with a generational garbage collector, a space and time profiler, and a comprehensive set of libraries.

Knit is a new component definition and linking language that can be used with C and assembly code. Knit supports component definitions that require little or no modification to existing code. It automatically schedules component initializers and finalizers and provides an extensible constraint system to detect subtle errors in component composition. Knit provides cross-module inlining that largely eliminates the overheads of componentization, supports component hierarchies, and supports cyclic component dependencies. Knit can be used for any C program, but is especially well suited for use in systems that have many separate components, multiple implementations of the same component, intricate initialization requirements, complex component interdependencies, low-level code and embedded systems, or code that is used in radically different configurations.

A practical lambda-calculator is a normal-order evaluator for the untyped lambda-calculus, extended with convenient commands and shortcuts to make programming in it more productive. Shortcuts are distinguished constants that represent terms. Commands define new shortcuts, activate tracing of all reductions, compare terms modulo alpha-conversion, print all defined shortcuts and evaluation flags, etc. Terms to evaluate and commands are entered at a read-eval-print-loop (REPL) "prompt" or "included" from a file by a special command. A Haskell branch is an embedding of the lambda calculator (as a domain-specific language) into Haskell. The calculator can be used interactively within Hugs or GHCi.

linkchk is a network link ping monitor. It supports both IPv4 and IPv6. It works by repeatedly pinging a named host or the default gateway of a given interface. When the link is working the ping time is shown in a small GTK window or tty, otherwise the link status is shown. It is particularly useful for monitoring IP tunnels or dialup links.

Haskell Ports Library provides ports in Haskell.
Ports are an abstraction for modelling variables
whose values evolve over time without the need to
resort to mutable variable, such as
IORefs. More precisely, a port represents all
values that a time-dependent variable successively
take as a stream, where each element of the stream
corresponds to a state change. A port supports
concurrent construction of the time series, or
stream of values. Ports are ideally suited for
purely functional GUI interfaces that completely
avoid the use of mutable variables.

RSA-Haskell is a collection of command-line cryptography tools and a cryptography library written in Haskell. It is intended to be useful to anyone who wants to secure files or communications or who wants to incorporate cryptography in their Haskell application. The libraries include Haskell implementations of SHA1, EME-OAEP, EMSA-PSS, MGF, RSAES-OAEP, and RSA-PSS. These standards implement signature/verification, strong cryptography, and hashing.

hsclock is an accurate, multi-zone GTK clock that
can also run in a tty. Currently configuration is
solely by commandline options. hsclock uses GTK
timeouts to synchronize with the system clock,
making display updates accurate to within
milliseconds. The time output format can be set
with a date-like format option.